IPA: /ˌʌnəˈpærənt/
KK: /ʌnəˈpɛrənt/
Not easily seen or understood; not obvious or clear.
The solution to the problem was unapparent until we examined the data closely.
Unapparent → It is formed from "un-" (meaning not) and "apparent" (from Latin "apparens", meaning visible or evident). The word "unapparent" means not visible or not evident.
Think of 'not' ('un-') making something 'visible' ('apparent') — that's why unapparent means something that is not visible.